Heat spreader-based heat sink module

A heat spreader-based heat sink module, comprising:

• a heat spreader;
• a radiation fin set consisted of a plurality of elongated radiation fins, each said radiation fin comprising an extension strip extended from each of two opposite long sides thereof, said radiation fins being arranged in parallel and joined to one another and spaced from one another at a predetermined distance by means of the extension strips thereof, the extension strips at one same long side of said radiation fins of said radiation fin set constituting a flat bottom surface and bonded with a top surface of said heat spreader;
• wherein:
• the said radiation fins located on a middle part of said radiation fin set are defined as middle radiation fins, and the other said radiation fins located on two opposite lateral sides of said radiation fin set are defined as lateral radiation fins;
• said lateral radiation fins are relatively shorter than said middle radiation fins;
• said lateral radiation fins have end edges thereof defining with said middle radiation fins at least two installation spaces, said at least two installation spaces being disposed at the two opposite lateral sides of said radiation fin set;
• each end of each of said middle radiation fins that protrudes over the respective one ends of said lateral radiation fins defines a bearing portion between one respective pair of said installation spaces at one of two opposite sides of said radiation fin set;
• the heat spreader-based heat sink module further comprises:
• at least one retaining frame made in the shape of an elongated frame bar, each said retaining frame comprising a holding-down segment on the middle and two mounting segments respectively extended from two opposite ends of said holding-down segment vertically downwards and then horizontally outwards, said holding-down segment of each said retaining frame being pressed on a top surface of one respective said bearing portion of each said middle radiation fin, said mounting segments of said at least one retaining frame being positioned in said installation spaces;
• and at least two screws mounted in said mounting segments of said at least one retaining frame;
• wherein said heat spreader is kept beyond said installation spaces.